package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;  // 订单表

    @Autowired
    private UserMapper userMapper; // 用户表

    @Autowired
    private WorkspaceService workspaceService; // 调用其他的service

    /**
     * 统计指定时间区间内的营业额数据
     *
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {

        // 当前list，用户存放从begin到end范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天的营业额
        List<Double> turnoverList = new ArrayList();
        for (LocalDate date : dateList) {
            // 查询date日期对应的营业额【状态为“已完成”订单金额合计】数据
            // order_time 类型是年：月：日 时：分：秒 ； 而 date 类型是 年；月：日
            // 把日期进行转换，date 转化为：当天开始时刻beginTime:0点0分0秒 和 结束时刻endTime 23点59分59.9999秒
            // 因为下单时间需要介于这两个时间
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = (turnover == null ? 0.0 : turnover); // 如果为空，就转成0.0
            turnoverList.add(turnover);  // 营业额存进list

            // select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
        }


        return TurnoverReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();

    }

    /**
     * 用户数据统计
     *
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 存放begin到end之间每天存放的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 存放每天新增的用户的数量 select count(id) from user where create_time <= ? and create_time >= ?  某一的开始 和 结束
        List<Integer> newUserList = new ArrayList<>();
        // 存放每天的总用户的数量 select count(id) from user where create_time <= ? 截至到某一天， 可以写一句动态sql来兼容这两个查询
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);

            // 总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);

            // 新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }


        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 统计指定时间内订单数据
     *
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        // 存放begin到end之间每天存放的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Object> orderCountList = new ArrayList<>();
        List<Object> validOrderCountList = new ArrayList<>();
        // 遍历dateList，查询每天的有效订单数 和 订单总数
        for (LocalDate date : dateList) {

            // 每天的订单总数  select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            orderCount = orderCount == null ? 0 : orderCount;
            orderCountList.add(orderCount);

            // 每天有效订单数  select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCount = validOrderCount == null ? 0 : validOrderCount;
            validOrderCountList.add(validOrderCount);
        }

        // 计算时间区间内的订单总数
        //Integer totalOrderCount =orderCountList.stream().reduce(Integer::sum).get();
        Integer totalOrderCounts = 0;
        for (Object integer : orderCountList) {  //方式二：普通for循环方式
            totalOrderCounts = totalOrderCounts + (Integer) integer;
        }


        // 计算时间区间内的有效订单数量
        //Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCounts = 0;
        for (Object integer : validOrderCountList) { //方式二：普通for循环方式
            validOrderCounts = validOrderCounts + (Integer) integer;
        }

        // 计算完成率

        Double orderCompletionRate = 0.0;
        if (totalOrderCounts != 0) {
            orderCompletionRate = totalOrderCounts.doubleValue() / validOrderCounts;
        }

        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCounts)
                .validOrderCount(validOrderCounts)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }


    /**
     * 抽取封装成一个方法
     * 根据条件查询订单的数量
     *
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {

        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }


    /**
     * 统计指定之间区间内销量排名前10
     *
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        // 写法一
        Set<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toSet());
        String nameList = StringUtils.join(names, ",");

        Set<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toSet());
        String numberList = StringUtils.join(numbers, ",");

        // 写法二： for循环

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 到处运营数据报表
     *
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30); //减30天的时间
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        BusinessDataVO businessDatavo = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2.通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/dateReportTemplate.xlsx");//在类路径下读取资源返回输入流对象

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件的Sheet文件
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDatavo.getTurnover()); //第3个单元格
            row.getCell(4).setCellValue(businessDatavo.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDatavo.getNewUsers());
            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDatavo.getValidOrderCount());
            row.getCell(4).setCellValue(businessDatavo.getUnitPrice());
            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDatavo.getTurnover());
                row.getCell(3).setCellValue(businessDatavo.getValidOrderCount());
                row.getCell(4).setCellValue(businessDatavo.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDatavo.getUnitPrice());
                row.getCell(6).setCellValue(businessDatavo.getNewUsers());
            }

            //3.通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
